Is she that ill? It's interesting that her health is her biggest issue.
The last five or six years of the marriage, I was plagued with asthmatic bronchitis. I'd get a cold, a day later I'd be on 9 powerful medications. It would take me a month or two to heal, so sick I could barely move. Since spouse left, I haven't been sick. A cold that lasted a few days once.
You both have had bouts of illness.. depression and alcohol for you. Whatever she has.
Extreme stress can wreak havoc to the immune system.